NAME

sys/un.h - definitions for UNIX domain sockets

SYNOPSIS

#include<sys/un.h>

DESCRIPTION

The <sys/un.h> header shall define the sockaddr_un structure that
includes at least the following members:
sa_family_tsun_family Address family.
charsun_path[] Socket pathname.
The sockaddr_un structure is used to store addresses for UNIX domain
sockets. Values of this type shall be cast by applications to structsockaddr for use with socket functions.
The sa_family_t type shall be defined as described in <sys/socket.h> .
Thefollowingsectionsareinformative.

APPLICATIONUSAGE

The size of sun_path has intentionally been left undefined. This is
because different implementations use different sizes. For example, 4.3
BSD uses a size of 108, and 4.4 BSD uses a size of 104. Since most
implementations originate from BSD versions, the size is typically in
the range 92 to 108.
Applications should not assume a particular length for sun_path or
assume that it can hold {_POSIX_PATH_MAX} characters (255).

RATIONALE

None.

FUTUREDIRECTIONS

None.

SEEALSO

COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .